For purposes of section twelve of this article:
Phase II: The experimental drug or treatment is given to, or a procedure is performed on, a larger group of people to further measure its effectiveness and safety.
Phase III: Further research is conducted to confirm the effectiveness of the drug, treatment or procedure, to monitor the side effects, to compare commonly used treatments and to collect information on safe use.
Phase IV: After the drug, treatment or medical procedure is marketed, investigators continue testing to determine the effects on various populations and to determine whether there are side effects associated with long-term use.
W. Va. Code § 9-2-12a